Predictive value of ECG changes for positioning inferior wall acute myocardial infarction related artery

Objective To explore the predictive value of ECG changes for positioning inferior wall acute myocardial infarction related artery(IWAMI-IRA).Methods To choose from July 2007 to July 2011 69 patients with IWAMI.To analyze the electrocardiograms aVL,V1,V2,V4R lead ST changes and III/II ST-elevation ratio and relate with the results of coronary artery angiography.Results Among these 69 cases,IRA was right coronary artery(RCA) in 55 cases(79.71%) and left circumflex(LCX) in 14 cases(20.29%);Ⅰ,aVL lead ST-segment depression,ratio of Ⅲ/Ⅱlead ST-eleation1,and V4R ST-elevation forecasted RCA for IRA.The sensitivity was 90.90%,92.73% and 89.09%,the specificity was 78.57%,85.71% and 85.71% individually.Ⅰ,aVL lead ST-elevation,ST-elevation ratio lead Ⅲ/Ⅱ≤1,and V1,V2 lead ST-segment depression forecasted LCX for IRA,the sensitivity was 78.57%,85.71% and 78.57%,the specificity was 94.55%,92.73% and 85.45% individually.Conclusion Most IWAMI-IRA is RCA pathological changes,a few is LCX lesions.Ⅰ,Ⅱ,Ⅲ,aVL,V1,V2 and V4R lead of ST changes and Ⅲ/Ⅱ lead ST-elevation ratio can be used as clinical predictors for AIMI-IRA.